For our temperature testing, we measure the peak GPU core temperature under load. A reading under load comes from running the 3DMark Time Spy stress test for 30 minutes.
Given that the RTX 3060 Ti uses the same cooler as the RTX 3070 Founders Edition, it’s not a surprise to see the 3060 Ti running fractionally cooler, as it’s using the same heatsink but with a lower power GPU. We saw the GPU peak at 69C during our testing, with a steady state result of 68C, so it’s 1-2C cooler than the RTX 3070 Founders Edition.